canal musculus sphincter ductus pancreatici channel duct epithelial duct pancreas

canalis vertebralis vagina vertebral canal pancreatic duct canal of Schlemm passage epithelial duct bile duct canalis cervicis uteri ductus deferens alimentary canal digestive tract gastrointestinal tract urethra canaliculus cartilaginous tube spinal canal ampulla Sylvian aqueduct lachrymal duct passageway ductule ejaculatory duct hepatic duct lymphatic vessel epididymis alimentary tract Schlemm's canal sinus ductulus common bile duct lymph vessel tear duct digestive tube inguinal canal umbilical GI tract canalis inguinalis sinus venosus sclerae salivary duct cervical canal seminal duct canal venous sinus Haversian canal bronchiole aqueductus cerebri ureter umbilical cord pore nasolacrimal duct channel lactiferous duct lacrimal duct cerebral aqueduct vas deferens

laticifer plant structure plant part vascular plant tracheophyte

airway air-intake air duct conduit air passage